8 grade physics formula and deformation formula speed, thank you

The formula of buoyancy: F floating = g row = ρ liquid GV row. When the object floats: F floating = g matter and ρ matter, G matter and ρ matter

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3. The derivation process of centripetal acceleration in high school physics An answer on the Internet Hello, first of all, draw a circle with radius R (uniform circular motion) Then take a random point and make its tangent, assuming that the right side of the pointing line is velocity v1; Find another point on the right side of the point. If the two points are very close to each other, make the tangent. Similarly, the right side of the tangent is the velocity v2, The two V's are equal in size and different in direction; Then connect the two points to the center of the circle respectively, and you will find that the distance between the two points on the arc is R * center angle (φ); Then, according to the moveability of the vector, it is translated to two velocities at the same starting point, and v2-v1 (i.e. △ V) is made; When the center angle (φ) is extremely small, the chord = arc can be obtained; Then the value of △ V is equal to V1 * center angle (φ); Time (T) = [R * center angle (φ)] / V1; The combination of two formulas Then a = (V * V) / R is obtained; There is also a step in this derivation process, which means that the value of △ V is equal to V1 * center angle (φ) I'm a little puzzled: why? Speed * center angle = speed? Please explain in detail, thank you!
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8. On the physical formula of volume 1. F floating = ρ liquid GV discharge 2. ρ = m / V I don't know whether V in 1,2 is v solid or V object. I want to make it clear The first formula, if a hollow ball is immersed in water, is row V the volume of hollow or solid, or the volume of hollow plus solid
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15. Liquid pressure formula P = f / S = g / S = mg / S = meat VG / S There is no problem, but the next step is p = f / S = g / S = mg / S = meat VG / S = meat SHSG / S = meat GH My question is: Meat VG / S = meat SHSG / S is also v = sh, in other words, this formula should only be used in regular container liquid pressure, in other words, if the liquid is in irregular container liquid (such as cone), it can not be used But the teacher said it was universal, Note: the so-called liquid pressure is only related to height and liquid density, which is derived from P = GH, so this definition can not be used to explain this formula If the secondary formula is correct, according to P = f / S = g / S = mg / S = meat VG / S = meat SHSG / S = meat GH, it can also be deduced that the pressure of solid is also related to height and density, in other words, it has nothing to do with volume and bottom area! According to you, it's liquid pressure: P = f / s But the solid pressure is also p = f / s In other words, as long as the formula is applicable to liquid pressure, it must also be applicable to solid pressure But the formula of fact doesn't work! Also, for example, put a piece of wood in a container with half a cup of water, and find out the pressure change of water on the bottom According to P = meat GH, we find that meat G is constant, h is larger and pressure is larger But according to P = f / S = g / S = mg / s, m, G and s are constant, so the pressure is constant The two contradict each other Ask for advice
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